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			JS: Power Up Steem
			
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		<p class="description">In this tutorial we will learn how to power up Steem to account itself or another account using Steemconnect as well as with Clientside signing method</p>
	

	<p><span class="fa-pull-left top-of-tutorial-repo-link"><span class="first-word">Full</span>, runnable src of <a href="https://github.com/steemit/devportal-tutorials-js/tree/master/tutorials/22_power_up_steem">Power Up Steem</a> can be downloaded as part of the <a href="https://github.com/steemit/devportal-tutorials-js">JS tutorials repository</a>.</span>
<br /></p>

<p>This tutorial runs on the main Steem blockchain. And accounts queried are real users with liquid STEEM balances.</p>

<h2 id="intro">Intro</h2>

<p>This tutorial will show few functions such as querying account by name and getting account balance. We are using the <code class="highlighter-rouge">call</code> function provided by the <code class="highlighter-rouge">dsteem</code> library to pull account from the Steem blockchain. A simple HTML interface is used to capture the account and its STEEM balance as well as allowing interactively power up part or all of STEEM to choose account.</p>

<h2 id="steps">Steps</h2>

<ol>
  <li><a href="#app-setup"><strong>App setup</strong></a> Setup <code class="highlighter-rouge">dsteem</code> to use the proper connection and network.</li>
  <li><a href="#search-account"><strong>Search account</strong></a> Get account details after input has account name</li>
  <li><a href="#fill-form"><strong>Fill form</strong></a> Fill form with account reward balances</li>
  <li><a href="#power-up"><strong>Power up</strong></a> Power up STEEM with Steemconnect or Client-side signing.</li>
</ol>

<h4 id="1-app-setup-">1. App setup <a name="app-setup"></a></h4>

<p>Below we have <code class="highlighter-rouge">dsteem</code> pointing to the production network with the proper chainId, addressPrefix, and endpoint. There is a <code class="highlighter-rouge">public/app.js</code> file which holds the Javascript segment of this tutorial. In the first few lines we define the configured library and packages:</p>

<div class="language-javascript highlighter-rouge"><pre class="highlight"><code><span class="kr">const</span> <span class="nx">dsteem</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'dsteem'</span><span class="p">);</span>
<span class="kd">let</span> <span class="nx">opts</span> <span class="o">=</span> <span class="p">{};</span>
<span class="c1">//connect to production server</span>
<span class="nx">opts</span><span class="p">.</span><span class="nx">addressPrefix</span> <span class="o">=</span> <span class="s1">'STM'</span><span class="p">;</span>
<span class="nx">opts</span><span class="p">.</span><span class="nx">chainId</span> <span class="o">=</span>
    <span class="s1">'0000000000000000000000000000000000000000000000000000000000000000'</span><span class="p">;</span>
<span class="c1">//connect to server which is connected to the network/production</span>
<span class="kr">const</span> <span class="nx">client</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">dsteem</span><span class="p">.</span><span class="nx">Client</span><span class="p">(</span><span class="s1">'https://api.steemit.com'</span><span class="p">);</span>
</code></pre>
</div>

<h4 id="2-search-account-">2. Search account <a name="search-account"></a></h4>

<p>After account name field is filled with some name, we do automatic search for account by name when input is focused out. HTML input forms can be found in the <code class="highlighter-rouge">index.html</code> file. The values are pulled from that screen with the below:</p>

<div class="language-javascript highlighter-rouge"><pre class="highlight"><code>    <span class="kr">const</span> <span class="nx">accSearch</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'username'</span><span class="p">).</span><span class="nx">value</span><span class="p">;</span>
    <span class="kr">const</span> <span class="nx">_account</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">client</span><span class="p">.</span><span class="nx">database</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="s1">'get_accounts'</span><span class="p">,</span> <span class="p">[[</span><span class="nx">accSearch</span><span class="p">]]);</span>
    <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="err">`</span><span class="nx">_account</span><span class="err">:`</span><span class="p">,</span> <span class="nx">_account</span><span class="p">);</span>
</code></pre>
</div>

<h4 id="3-fill-form-">3. Fill form <a name="fill-form"></a></h4>

<p>After we fetched account data, we will fill form with STEEM balance and show current balance details.</p>

<div class="language-javascript highlighter-rouge"><pre class="highlight"><code><span class="kr">const</span> <span class="nx">name</span> <span class="o">=</span> <span class="nx">_account</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">name</span><span class="p">;</span>
<span class="kr">const</span> <span class="nx">steem_balance</span> <span class="o">=</span> <span class="nx">_account</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">balance</span><span class="p">;</span>
<span class="kr">const</span> <span class="nx">balance</span> <span class="o">=</span> <span class="err">`</span><span class="nx">Available</span> <span class="nx">Steem</span> <span class="nx">balance</span> <span class="k">for</span> <span class="nx">$</span><span class="p">{</span><span class="nx">name</span><span class="p">}</span><span class="err">:</span> <span class="nx">$</span><span class="p">{</span><span class="nx">steem_balance</span><span class="p">}</span><span class="o">&lt;</span><span class="nx">br</span><span class="o">/&gt;</span><span class="err">`</span><span class="p">;</span>
<span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'accBalance'</span><span class="p">).</span><span class="nx">innerHTML</span> <span class="o">=</span> <span class="nx">balance</span><span class="p">;</span>
<span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'steem'</span><span class="p">).</span><span class="nx">value</span> <span class="o">=</span> <span class="nx">steem_balance</span><span class="p">;</span>
<span class="kr">const</span> <span class="nx">receiver</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'receiver'</span><span class="p">).</span><span class="nx">value</span><span class="p">;</span>
</code></pre>
</div>

<h4 id="4-power-up-">4. Power up <a name="power-up"></a></h4>

<p>We have 2 options on how to Power up. Steemconnect and Client-side signing options. By default we generate Steemconnect link to Power up (transfer to vesting), but you can use client signing option to Power up right inside tutorial, note client-side signing will require Active private key to perform operation.</p>

<p>In order to enable client signing, we will generate operation and also show Active Private key (wif) field to sign transaction right there client side.
Below you can see example of operation and signing transaction, after successful operation broadcast result will be shown in user interface. It will be block number that transaction was included.</p>

<div class="language-javascript highlighter-rouge"><pre class="highlight"><code><span class="nb">window</span><span class="p">.</span><span class="nx">submitTx</span> <span class="o">=</span> <span class="nx">async</span> <span class="p">()</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="kr">const</span> <span class="nx">privateKey</span> <span class="o">=</span> <span class="nx">dsteem</span><span class="p">.</span><span class="nx">PrivateKey</span><span class="p">.</span><span class="nx">fromString</span><span class="p">(</span>
        <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'wif'</span><span class="p">).</span><span class="nx">value</span>
    <span class="p">);</span>
    <span class="kr">const</span> <span class="nx">op</span> <span class="o">=</span> <span class="p">[</span>
        <span class="s1">'transfer_to_vesting'</span><span class="p">,</span>
        <span class="p">{</span>
            <span class="na">from</span><span class="p">:</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'username'</span><span class="p">).</span><span class="nx">value</span><span class="p">,</span>
            <span class="na">to</span><span class="p">:</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'receiver'</span><span class="p">).</span><span class="nx">value</span><span class="p">,</span>
            <span class="na">amount</span><span class="p">:</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'steem'</span><span class="p">).</span><span class="nx">value</span><span class="p">,</span>
        <span class="p">},</span>
    <span class="p">];</span>
    <span class="nx">client</span><span class="p">.</span><span class="nx">broadcast</span><span class="p">.</span><span class="nx">sendOperations</span><span class="p">([</span><span class="nx">op</span><span class="p">],</span> <span class="nx">privateKey</span><span class="p">).</span><span class="nx">then</span><span class="p">(</span>
        <span class="kd">function</span><span class="p">(</span><span class="nx">result</span><span class="p">)</span> <span class="p">{</span>
            <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'result'</span><span class="p">).</span><span class="nx">style</span><span class="p">.</span><span class="nx">display</span> <span class="o">=</span> <span class="s1">'block'</span><span class="p">;</span>
            <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span>
                <span class="s1">'result'</span>
            <span class="p">).</span><span class="nx">innerHTML</span> <span class="o">=</span> <span class="err">`</span><span class="o">&lt;</span><span class="nx">br</span><span class="o">/&gt;&lt;</span><span class="nx">p</span><span class="o">&gt;</span><span class="nx">Included</span> <span class="k">in</span> <span class="na">block</span><span class="p">:</span> <span class="nx">$</span><span class="p">{</span>
                <span class="nx">result</span><span class="p">.</span><span class="nx">block_num</span>
            <span class="p">}</span><span class="o">&lt;</span><span class="sr">/p&gt;&lt;br/</span><span class="o">&gt;&lt;</span><span class="nx">br</span><span class="o">/&gt;</span><span class="err">`</span><span class="p">;</span>
        <span class="p">},</span>
        <span class="kd">function</span><span class="p">(</span><span class="nx">error</span><span class="p">)</span> <span class="p">{</span>
            <span class="nx">console</span><span class="p">.</span><span class="nx">error</span><span class="p">(</span><span class="nx">error</span><span class="p">);</span>
        <span class="p">}</span>
    <span class="p">);</span>
<span class="p">};</span>
</code></pre>
</div>

<p>That’s it!</p>

<h3 id="to-run-this-tutorial">To run this tutorial</h3>

<ol>
  <li>clone this repo</li>
  <li><code class="highlighter-rouge">cd tutorials/22_power_up_steem</code></li>
  <li><code class="highlighter-rouge">npm i</code></li>
  <li><code class="highlighter-rouge">npm run dev-server</code> or <code class="highlighter-rouge">npm run start</code></li>
  <li>After a few moments, the server should be running at <a href="http://localhost:3000/">http://localhost:3000/</a></li>
</ol>

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